Hi, thanks for asking from HCM. I can understand your concern. The persistent headache after head injury could be : Concussion - Yes it is one possibility. It is a type if blunt head injury followed by momentary loss of consciousness. It is a very common sports injury. Treatment is bed rest and observation. For pain, you can give him tab Diclofenac sodium after proper prescription. If headache persists than consult doctor for evaluation and need of CT scan of head. : Scalp hematoma - It is collection of blood and reactionary fluid in scalp layers after head injury. It presents as bump or knot or swelling at local site. You can feel warm tender skin along with redness. It is treated by applying cold compresses keeping head and elevated wait and watch taking tablet Diclofenac sodium after proper prescription. You can correlate his findings and treat him accordingly. If still no relief, consult doctor. Sometimes minor post traumatic brain bleed can cause headache. It can be suspected if no relief in pain, focal deficit, memory problem. Confirmation is by CT head. Further managent is after CT report. Hope it will help you. Thanks. Take care.